It worked well in DM and it wasn't actually that easy to get yourself up levels without fighting monsters once you got to a certain point. Ninja and priest classes were used by most people just as ways of levelling up so that they could get the health and mana bonuses - but I never had a character get beyond craftsman in anything, before I'd completed "choose your door, choose your fate" and only in the bit where the screamers spawn, just before "this is my prisoner..." would I ever stop and grind out levels like that, and then only when I had screamers to throw my attacks at. I can't beleive anyone got to be an archmaster ninja in DM by punching a wall
I'm sure though, if this was the case in grimrock we'd have a bunch of people complaining that the game is rubbish because they have to stand around for ages attacking walls in order to get anywhere, and then it makes them too powerful - much like we have people complaining that the only way to fight monsters is to dance around them. Because of course you have to do it like that that, and you never get hit, and there's always enough space. The game simply FORCES you to do it (sometimes forcing you to backtrack half a level to find a nice 2x2 spot)
